Texas Instruments LM5145

Description

The LM5145 75-V synchronous buck controller is designed to regulate from a high input voltage source or from an input rail subject to high voltage transients, minimizing the need for external surge suppression components. A high-side switch minimum on-time of 40 ns facilitates large step-down ratios, enabling the direct step-down conversion from 48 V to low-voltage rails for reduced system complexity and solution cost. The LM5145 continues to operate at nearly 100% duty cycle during input voltage dips as low as 6 V, making it well suited for high-performance industrial control, robotic, datacom and RF power amplifier applications.

Features

Versatile Synchronous Buck DC-DC Controller– Wide Input Voltage Range of 6 V to 75 V– Adjustable Output Voltage From 0.8 V to 60 V

• Meets EN55022 / CISPR 22 EMI Standards
• Lossless RDS(on) or Shunt Current Sensing
• Switching Frequency From 100 kHz to 1 MHz– SYNC In and SYNC Out Capability
• 40-ns Minimum On-Time for High VIN / VOUT Ratio
• 140-ns Minimum Off-Time for Low Dropout
• 0.8-V Reference With ±1% Feedback Accuracy
• 7.5-V Gate Drivers for Standard VTH MOSFETs– 14-ns Adaptive Dead-Time Control– 2.3-A Source and 3.5-A Sink Capability– Low-Side Soft-Start for Prebiased Start-Up
• Adjustable Soft-Start or Optional Voltage Tracking
• Fast Line and Load Transient Response– Voltage-Mode Control With Line Feedforward– High Gain-Bandwidth Error Amplifier
• Precision Enable Input and Open-Drain PowerGood Indicator for Sequencing and Control
• Inherent Protection Features for Robust Design– Hiccup Mode Overcurrent Protection– Input UVLO With Hysteresis– VCC and Gate Drive UVLO Protection– Thermal Shutdown Protection With Hysteresis
• VQFN-20 Package With Wettable Flanks
• Create a Custom Design Using the LM5145 With

Typical applications

• Industrial Motor Drives
• Remote Radio Unit (RRU) and BTS,Networking and Computing Power
• Non-Isolated PoE and IP Cameras

More information

• Datasheet
• IC product information